Chemistry / Chem 1890 · Atom · ~20 seconds
Buffer Composition Requirement
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An effective buffer needs comparable amounts of a weak acid and its conjugate base, since running out of either removes its capacity to absorb more.
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Acetic acid and sodium acetate in roughly equal amounts buffer well; pure acetic acid alone does not.
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A weak acid alone, with no conjugate base present, is only half the needed pair.